Laserfiche WebLink
Blue Pit <br />Groundwater <br />112 Permit Amendment <br />The groundwater level limits the mining of the deposit at approximately 90 -12o feet deep in the <br />expansion area and 6o -77 feet in the current permit area. The groundwater surface is estimated <br />from the existing excavation and by exploration drilling conducted in the area. Groundwater will <br />not be intercepted my mining. It is believed that the groundwater level is deeper in the western <br />portion of the pit due to seepage from the existing Basin Ditch which makes the water level higher <br />in the eastern portion of the permit area. <br />There are no visible seeps or springs, and groundwater is not expected to be encountered during <br />mining. While no groundwater is anticipated to be exposed by excavation, if it is exposed, <br />excavation will cease at an elevation of 2 feet above the groundwater level. <br />Water for this site is supplied from the Basin Ditch, and a well on site. All of these structures are <br />shown on Map C -i. The mining operation has an approved augmentation plan for the use of the <br />water from the Basin Ditch which is located in Appendix A. The water is used for dust suppression, <br />material crushing, screening washing and concrete production. <br />Irrigation Water <br />Irrigation has historically occurred on the vast majority of the permit area. The irrigation water <br />comes from the Basin and Spring Ditches, where the property owner has existing irrigation rights. <br />See Appendix A. Once the site is fully reclaimed, these rights will be used to irrigate the bottom <br />area, as shown on Map F. <br />Water Consumption for the Operation <br />The Pit is on an elevated terrace and there is no groundwater on the terrace. This is known from <br />existing operations on the terrace further north of this site and also the lack of springs emanating <br />from the base of the gravel anywhere on the site. There is very little moisture in the gravel that will <br />evaporate when the material is mined. <br />The peak usage is not going to change at this site since production is not changing. The approved <br />Augmentation plan allows for 7.4 acre -feet of water to be pulled from the Basin Ditch each year. <br />i) Water supply requirements are not changing as part of this application. The <br />estimated supply requirements are 7.4 acre -feet per year. The breakdown is as <br />follows: <br />Pond Evaporation 1.35 Acre -feet <br />Dust Control 1.54 Acre -feet <br />Crusher / Screen 2.09 Acre -feet <br />Concrete Truck Washout 2.38 Acre -feet <br />Blue Pit May 2014 G -8 <br />